Sine gage



Aug. 17,

E. L.. GUTKNECHT SINE GAGE Filed Feb. 15, 1962 IN VEN TOR. bn/A20 L'z/rK/vfcffr BYv Mm Arm/Vey E United States Patent O 3,200,503 SHNE GAGEEdward L. Gutknecht, Norwalk, Qaiif. (11434 Planett St., Downey, Calif.)Filed Feb. 13, 1962, Ser. No. 173,069 2 Claims. (Cl. i3-174) Thisinvention relates to a sine bar gage or iiXture, the same having theusual purposes of measuring and/ or checking the accuracy of the angularrelationship of the surfaces of a piece of work.

The present invention is characterized by simplicity and low cost of asine bar gage and it is an object of the invention to provide asimplified construction which, therefore, may be economically produced.

Another object of the invention is to provide a sine bar fixture that,because the same is provided with a onepiece gage element, has greateraccuracy than such an element assembled from several components and,moreover, has greater stability and accuracy in use.

A further object of the invention is to provide an adjustable sine bargage that, in addition to the usual purposes of gaging and measuringangles of a piece of work that has one right angle, disposes said angle,regardless of adjustment of the bar, at a constant position from the topof a supporting base, thereby enabling quicker set-up and more accurategaging operation.

'this invention also has for its objects to provide such means that arepositive in operation, convenient in use, easily installed in a workingposition and easily disconnected therefrom, economical of manufacture,relatively simple, and of general superiority and serviceability.

The invention also comprises novel details of construction and novelcombinations and arrangements of parts, which will more fully appear inthe course of the following description and which is base-d on theaccompanying drawing. However, said drawing merely shows, and thefollowing description merely describes, one embodiment of the presentinvention, which is given by way of illus tration or example only.

1n the drawing, like reference characters designate similar parts in theseveral views.

PEG. l is a plan view of a sine bar gage according to the presentinvention.

EEG. 2 is a side elevational View thereof, with portions in section.

The sine bar gage that is illustrated comprises, generally, a base 5, asine bar 6 mounted on said base in angular adjusted position accordingto the height of a gage block 7 interposed between said base and sinebar, and means S to lock the adjustment. The gage block '7,

er se, forrns no part of the present invention; the same, while shown asa single element, is representative of one block or two or more blocksin stack relation and is selected according to the angle to bedetermined according to its sine function. The thickness or height ofthe gage block 7 has an indicated ratio to the elfective length of thesine bar between its two points of support.

The base is shown as a rectangular plate having lower and upper parallelfaces 1@ and 11, respectively. The upper face 11 should be accuratelydat, although the surface may be interrupted for lightening and otherpurposes.

The sine bar o preferably comprises a one-piece member having a leg 12and a normal le7 13 to form an angle, it being essential that theincluded angle 14 be an accurate right angle.

While in practice the thickness of legs 12 and 13 may vary, it isimportant to the invention that the outside bearing corner 15 where theouter faces of the legs meet be generated on an arc around the insidecorner 16 where the inner faces 17 and 1d of the respective bar legs 12and ICC 13 join. It will be clear that, through a range of 90 or anydesired portion thereof, the bar 6 may be rocked on said outside corner15 and that in all rocked positions, the corner 16 has a constantdistance from the base surface 11 relative to which the sine bar isoperatively rocked. The radius 19 indicates that at least insofar as thebar leg 1.2 is concerned, the lower or outer face 2l) of said leg andthe upper or inner face 17 are parallel. Hence, when the sine bar isdisposed flatwise on the base face 11, the face 17 of said bar will beparallel to the base face 11 and spaced therefrom the distance 19.

According to the invention, a convex arcuate bearing corner 21 is formedin the lower face 2i) of the leg 12 in spaced relation to the corner 15and, as shown, preferably l nearer the end 22 of said leg Athan to thecorner 15. Said corner 21 is generated on an arc having a radius 23 withits center 24 on the sine bar face 17. It will be clear that said radii19 and 23 are exactly the same size and that the arcs 15 and 21 areexactly alike.

From the foregoing, it will be evident that the respective bearingpoints of tangency 25 and 26 of the arcuate faces 15 and Z1 with thesurface 11 of the base and the surface 27 of a gage block 7 will beequal to the spacing from each other 'of the generation points 16 and24, and that said spacing of the points of tangency remains constant forall angular positions of the sine bar relative to the base.

rfhe locking means 8 is shown as a spherical seat 28 in the under sideof the base 5 and preferably midway between lthe sides thereof, aspherical seat 29 in the upper side of the sine bar leg 12, respectiveflared openings 3i) and 31 extending from said spherical seats throughthe base and leg 12, respectively, and a locking bolt 32 that extendsthrough said openings and has a spherical nut 33 engaged with seat 2Sand a spherical head 34 engaged with seat 29. It will be seen that saidlocking bolt draws the sine bar down onto the base face 11 to engagesaid face and the face 27 of a gage block 7 in the manner abovedescribed.

Since the bolt 32 is the only connecting means between the base and thesine bar, the block 7 may have any desired position on the base,providing face 27 thereof is engaged by the arcuate corner 21. Also, asthe angle of adjustment between the base and sine bar is changed, theangle of the bolt 32 will change accordingly and there will be acorresponding shift of the sine bar relative to the base. In otherwords, the point of tangency 25 will shift7 as will the position of theblock 7 and the point of tangency 26. Yet the relationship of saidpoints remains constant, as does the spacing of corner 16 relative tobase face 11.

When gaging a work piece having a right angle corner disposed in theangle 112i of the bar 6 and its sides bearing on the faces 17 and 18,the face 35 of said work piece is the one ordinarily checked by a heightgage, for instance. Since the corner 16 is at a constant distance fromface 11, the height gage, once its relationship to the work piece face35 has been established, does not require to be readjusted for anychange in the lateral position of the sine bar. The same height block 7,regardless of shifts in its lateral position engaged with the corner 21,will always bring the sine bar to an angular position in which the face35 of a work piece may be gaged by a pre-set, undisturbed height gage.It will be evident that, in prior sine bars that use cross pins foradjusting the position thereof, the point comparable to the presentcorner 16 does not maintain a constant relationship to the base face,but rises and lowers because the fulcrum keeps changing with changes ofangle of the sine bar.

While the foregoing has illustrated and described what is nowcontemplated to be the best mode of carrying out the invention, theconstruction is, of course, subject to u, modification without departingfrom the spirit and scope of the invention. Therefore, it is not desiredto restrict the invention to the particular form of constructionillustrated and described, but to cover all modifications that may fallwithin the scope of the appended claims.

Having thus described this invention, what is claimed and desired to besecured by Letters Patent is:

1. In a sine gage having a base with a at support face upon which a gageblock lis adapted to be positioned with one gage face thereof on saidsupport face and a parallel gage face thereof elevated according to theheight of thc block,

(a) in sine bar of uniform thickness having an upper gaging surface anda parallel lower surface and provided with longitudinally spaced arcuatebearing surfaces that are formed in said lower surface, the radii of thearcuate bearing surfaces and the thickness of the sine bar being equal,

(b) the centers of generation of curvature of said bearing surfacesbeing located on the upper gaging surface of the sine bar,

(c) one of said arcuate surfaces being in tangential bearing engagementwith the support face of the base and the other being in tangentialbearing engagement with the elevated gage face of the gage block, and

(d) means to adjustably connect the base and sine bar.

2. `In a sine gage having a base with a at support face upon which agage block is adapted to be positioned with one gage face thereof onsaid support face and a parallel 4- gage face thereof elevated accordingto the height of the block,

(a) a sine bar of uniform thickness having an upper gaging surface and aparallel lower surface and provided with longitudinally spaced arcuatebearing surfaces that are formed in said lower surface, said sine barfurther having an integrally formed leg with a surface normal to 4thegaging surface of the bar,

(b) the centers of generation of curvature of said bearing surfacesbeing located on the upper gaging surface of the sine bar, the center ofgeneration of one bearing surface being located at the corner where saidgaging and normal surfaces meet,

(c) one of said arcuate surfaces being in tangential bearing engagementwith the support face of the base and the other being in tangentialbearing engagement with the elevated gage face of the gage block, and

(d) means to adjustably connect the base and sine bar.

References Cited by the Examiner UNITED STATES PATENTS 2,446,562 8/48Trbojevich 33-174 2,447,889 8/48 Adler 33-174 2,645,026 7/53 Trbojevich33-174 2,645,067 7/53 Hinderer 33-174 2,649,785 8/53 Sirko 33-174 LOUISR. PRNCE, Primary Examiner.

ISAAC LISANN, Examiner.

1. IN A SINE GAGE HAVING A BASE WITH A FLAT SUPPORT FACE UPON WHICH AGAGE BLOCK IS ADAPTED TO BE POSITIONED WITH ONE GAGE FACE THEREOF ONSAID SUPPORT FACE AND A PARALLEL GAGE FACE THEREO ELEVATED ACCORDING TOTHE HEIGHT OF THE BLOCK, (A) IN SINE BAR OF UNIFORM THICKNESS HAVING ANUPPER GAGING SURFACE AND A PARALLEL LOWER SURFACE AND PROVIDED WITHLONGITUDINALLY SPACED ARCUATE BEARING SURFACES THAT ARE FORMED IN SAIDLOWER SURFACE, THE RADII OF THE ARCUATE BEARING SURFACES NAD THETHICKNESS OF THE SINE BAR BEING EQUAL, (B) THE CENTERS OF GENERATION OFCURVATURE OF SAID BEARING SURFACES BEING LOCATED ON THE UPPER GAGINGSURFACE OF THE SINE BAR, (C) ONE OF SAID ARCUATE SURFACES BEING INTANGENTIAL BEARING ENGAGEMENT WITH THE SUPPORT FACE OF THE BASE AND THEOTHER BEING IN TANGENTIAL BEARING ENGAGEMENT WITH THE ELEVATED GAGE FACEOF THE GAGE BLOCK, AND (D) MEANS TO ADJUSTABLY CONNECT THE BASE AND SINEBAR.